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Can someone try to call this function from gdiplus.dll on a Windows 8.1 machine and confirm that is working or not? I am pretty sure it worked well on other versions but now I still get this error: A simple code for test can be this one: #AutoIt3Wrapper_UseX64=n #include <ScreenCapture.au3> #include <Memory.au3> _GDIPlus_Startup() Local $hBitmap = _ScreenCapture_Capture('',0,0,-1,-1,False) _GDIPlus_SaveImageToStream($hBitmap) _GDIPlus_Shutdown() Func _GDIPlus_SaveImageToStream($hBitmap, $iQuality = 50, $Encoder = "jpg") ;coded by Andreik, modified by UEZ, FS Local $tParams Local $tData Local $pData Local $pParams Local $sImgCLSID = _GDIPlus_EncodersGetCLSID($Encoder) Local $tGUID = _WinAPI_GUIDFromString($sImgCLSID) Local $pEncoder = DllStructGetPtr($tGUID) If $Encoder == "jpg" Or $Encoder == "jpeg" Then $tParams = _GDIPlus_ParamInit(1) $tData = DllStructCreate("int Quality") DllStructSetData($tData, "Quality", $iQuality) ;quality 0-100 $pData = DllStructGetPtr($tData) _GDIPlus_ParamAdd($tParams, $GDIP_EPGQUALITY, 1, $GDIP_EPTLONG, $pData) $pParams = DllStructGetPtr($tParams) Else $pParams = 0 EndIf Local $hStream = DllCall("ole32.dll", "uint", "CreateStreamOnHGlobal", "ptr", 0, "bool", True, "ptr*", 0) If @error Then Return SetError(1, 0, 0) $hStream = $hStream[3] DllCall($ghGDIPDll, "uint", "GdipSaveImageToStream", "ptr", $hBitmap, "ptr", $hStream, "ptr", $pEncoder, "ptr", $pParams) _GDIPlus_BitmapDispose($hBitmap) Local $hMemory = DllCall("ole32.dll", "uint", "GetHGlobalFromStream", "ptr", $hStream, "ptr*", 0) If @error Then Return SetError(2, 0, 0) $hMemory = $hMemory[2] Local $iMemSize = _MemGlobalSize($hMemory) Local $pMem = _MemGlobalLock($hMemory) $tData = DllStructCreate("byte[" & $iMemSize & "]", $pMem) Local $bData = DllStructGetData($tData, 1) Local $tVARIANT = DllStructCreate("word vt;word r1;word r2;word r3;ptr data;ptr") DllCall("oleaut32.dll", "long", "DispCallFunc", "ptr", $hStream, "dword", 8 + 8 * @AutoItX64, "dword", 4, "dword", 23, "dword", 0, "ptr", 0, "ptr", 0, "ptr", DllStructGetPtr($tVARIANT)) ;<a href='http://msdn.microsoft.com/en-us/library/windows/desktop/ms221473(v=vs.85' class='bbc_url' title='External link' rel='nofollow external'>http://msdn.microsoft.com/en-us/library/windows/desktop/ms221473(v=vs.85</a>).aspx _MemGlobalFree($hMemory) Return $bData EndFunc ;==>_GDIPlus_SaveImageToStream